Cotton threshing cylinder



Nov. 15, 1932. J. E. MITCHELL ,1,887,562

COTTON THRESHING CYLINDER Filed Nov. 6, 1930 cwif7 /N VEA/Toer JOHN .6. M/rcf/LL MMM Patented Nov. 15, *1932 `umTED- Simms JOHN E. MITCHELL,

PATE

or DALLAS, TEXAS Y f (mirroir."I'HRESH,ING CYLINDER Application med November 6, 1939. 1 Serial No. 498,764.

hullsV and'other extraneous matter sothat it may be screened outor in'some otherway separated from the cotton. Such devices also operate to break open tight bolls soas to en.- 'able extracting saws to separate the cotton from the trash and hulls. i As heretofore constructed all of these threshing or cleaning cylinders are inthe form of drums having a continuous periphery, and provided with spikes or pins secured in and projecting from this periphery.

In one type-of threshing cylinder, threaded pins are screwed into the surface of a wooden drum. This presents an unsatisfactory construction for the reason that the pins when comingV into contact with foreign matter v'such as' stones, pieces of metal,` and the that it WillI not stay in runningbalance;l itv is difficult to holdinproper shape and Vto replace wooden portions when damaged. Y Another type Vof threshing cylinder is in the form of a hollow steel drum with shouldered pins riveted through the-wa`lls of the drum. This type of cylinder is objectionable inthat the entire cylinder must be replaced if too many of the pins or spikes become broken Vor damaged. YIt is also dificult to construct, especially inthe smaller diameters, and is further objectionablein the tendency for trash to accumulate inside the drum. f

My invention is characterized by the fact that the threshing cylinder is of skeleton form, and hence very lighty inproportion to its strength, especially as compared with former types of threshing cylinders. Furthermore,this form of construction lends itself to replaceable parts carrying the pins or spikes, and to the prevention of accumulation of cotton, trash, etc. inside the cylinder.v x

There -are certain features of Vconstruction which also enter into the novelty ofthe cylshaft l.

ginder, but these vwill be better understood I from the detailed description of the invention to follow.-

In the accompanying illustrating the invention v Fig. l is a broken, side elevation of a threshing cylinder constructed according to my insheet of drawing vention; and` Fig. 2 is a. cross-sectional viewy taken onthe line 2 2 of Fig. 1.

Referring now tothe drawingthe numeral 4 l indicates the shaft of the cylinder on` which 'are mounted aseres of spiders 2 on the outer sidesy of which are secured four angular spikebars 3. In practice I employ sevfen ofthe spiders 2, seton nine inch centers along the Each of these spiders has a hub 4 for mounting the spider on the shaft, and the spider is secured on the shaft by means Ycfa set `screw 5 screwed through said hub andenj70 gaging at its inner end the surface ofshaft 1. Each of the spiders 2 is of the shape lshown in Fig. 2, that isto say,it is provided vwith four relatively narrow fiat sides 6, a straight edge 7 extendinginwardly from one end of 575 each of the fiat sides 6 parallel to a radial line drawn throughthe center of its hub, and an `inclined side 8 extending from thebottom of each straightiedge 7 to the-end of the adjacent flat side V6 opposite to that from'ao f which its straightedge 7 extends. z

AEach of the angular spike bars 3 consists of a flat rectangular member, or bar proper,

9, fromone side of which and formed` intel gral therewith, extends, a side member 0r`8`5 shield 10. The bar portion 9 of each oftheV Yspike bars is of considerably greater thickness than the side member or shieldlO thereof, and is apertured at intervals throughoutA Y Y its length to receive arseries of-shoulderedao spikes 1l, which are preferably` riveted in P1aCe,as indicated at 1 Y .Y

The spike bars 3 are'adapted to be mountis seated on one kof the lines of flat sides Grof the'spiders'2 andits side memberforshield 10'wil1 rest upon :the corresponding inclined.

sides 8 of the series of spiders, as clearlyil-'M 100 OFFICE',

lustrated in Fig. 2. To secure the spike bars in place, I provide each of the spiders 2 with an apertured flange 13, projecting at right angles to the body of the spider at each of the flat sides 6, and pass bolts 14 through the bar portions 9 of the spikebars and through the apertures in said anges, and secure said bolts in place by means of nutsl.

From the foregoing description it will be seen that the sides l0 of the angle bars form shields, and with the cylinder rotating in the direction indicated b y the arrow in F ig. 2, these shields prevent any cotton or trash from getting into the interior ofthe cylinder. In'Y other words, any cotton vor trash striking against the shields 10 is immediately thrown o by centrifugal action. The sides 10 of the angle bars not only prevent the accumulation ofrcottonV and trash inside the cylinder but they also greatly strengthen the cylinder against strains exerted in a direction toward the shaft, such strains being frequently met with as a result of blocks of wood, pieces of iron and other foreign matter going into the machine with the cotton. n

As has heretofore been pointed out, the peripheral side 9 of each angle bar is much thicker than the inclined side portion or shield l0. The reason for this 4is that strength is especially needed where the spikes are riveted through the steel, as these spikes are constantly striking against pieces of wood, iron and other foreign matter mixed with the cotton. On the other hand, the side portion or shield 10 does not have to kwithstand any such strains, and to make it of the same thickness as the peripheral side 9 would result in a very heavy and cumbersome From the foregoing it will be seen that my improved threshing cylinder can be made a great deal lighter, and will be less expensive to manufacture than the types of threshing tylinders heretofore used, without at the same time sacrificing anything in necessary strength, while at the same time possessing the advantage of the closed type of cylinder in the respect of'preventing the accumulation of cotton and trash inside the cylinder. I

The spike bars 3 are, of course, replaceable, andL should any of the spikes be broken off, or the spike bar itself be injured by impact with a heavy foreign body, it may readily be removed by u'screwing the nuts l5 and a new spike bar inserted therefor.V

I wish itunderstood that the invention is not limited to the precise shapeand arrangement of parts illustrated in the drawing, al

though this shows the preferred embodiment of the invention, but that various changes lcould be made in the form, construction and arrangement of parts without departing vfrom the spirit of my invention as de'ned in the appended claims. v j.

I claim:

l. A cotton threshing cylinder comprising a shaft, a series of flat-sided spiders mounted thereon, a series of independent spike-bars mounted on flat sides of said spiders to form the outer wall of the cylinder, each of said spike-bars having a dat peripheral .portion and an inwardly-directed straight side member forming a shield, theinner end of which terminates near, but below the plane of the flat portion of an adjacent spikefbar, and a row of radial spikes 'securedv in said peripheral portion.

-2.,A cotton threshing cylinder comprising a shaft, a series of flat sided spiders mounted thereon, a seriesV of independent spike-bars mountedron flat sides ofV said spiders to form the outer wall of the c 1- inder, each of said spike-bars having a at peripheral portion and an inwardly-directed straight side member, of greater width lthan :said peripheral portion, the innerk end of which terminates near, but below the plane of the flat portionof an adjacent spike-bar, and a row of radial spikes 'secured in said peripheral portion.

3. A cotton threshing cylinder comprising a shaft, a series of flat-sidedV spiders mounted thereon, a series of independent spike-bars mounted on fiat sides vof said spiders to form the outer wall of the cylinder, each of said spike-bars having a narrow, relatively thick, flat, peripheral portion and a relatively thin, inwardly directed, straight side member forming a shield, the inner end of Vwhich terminates near, but below the plane of the flat portion of an adjacent spike bar, and a row ofl radial spikes secured in said peripheral portion. j

4. A cotton threshing cylinder comprising a shaft, a series of flat sided spiders mounted thereon, a series of independently removable angular spike bars mounted on flat sides of said spiders to form the outer wall of the cylinder, one member of each.

spike-bar vbeing fiat, and lrelatively `narrow and thick, its fiat side forming a peripheral portion of the cylinder, and the other member being straight, relatively thin and of greater width than the width of said peripheral member and inclined toward the shaft to form a shield, the inner endV of which terminates near, but below theplane of the peripheral portion of an adjacent spike bar, and a row of radial spikes secured in said peripheral member.

5. A cotton threshing cylinder comprising a shaft, a series of rectangular spiders mounted thereoneach of which has four relatively narrow flat sides located opposite each other, the flat sides at corresponding points of the spiders being in the same plane, longitudinal spike bars removably mounted on said flat sides of the spiders to form the outer wall of the cylinder, each of said kspike barsY having a at portion removably secured to the spiders on an aligning set o f the fiat sidesthereof and an inwardly directed straight side member forming a shie1d,'the inner end of which terminates near, but below the plane of the Hat portion of an adjacent spike-bar, and a row of radial spikes secured in the fiat portions of each of said spike bars. p

In testimony whereof, I havehereunto set Y my hand. l Y f t JOHN E. MITCHELL. 

